The **RS-5D3-R2** is a specialized, high-reliability electromagnetic relay, often utilized in aerospace, defense, and high-performance industrial applications. It is part of the RS series, known for its miniature size and robust environmental resistance. --- ### 1. Key Technical Specifications The following table highlights the primary electrical and mechanical characteristics of the RS-5D3-R2: | Parameter | Specification | |:---|:---| | **Contact Arrangement** | 2 Form C (DPDT - Double Pole Double Throw) | | **Coil Voltage (Nominal)** | 5 VDC | | **Coil Resistance** | Approximately 50 - 64 Ohms (varies by sub-series) | | **Contact Rating** | 1.0A to 2.0A at 28 VDC (Low Level to Power) | | **Mounting Type** | Through-hole (PCB Mount) | | **Enclosure** | Hermetically Sealed (Metal Can) | | **Temperature Range** | -65°C to +125°C | --- ### 2. Functional Components The device consists of three main internal electronic/mechanical sections: * **The Coil Assembly:** A precision-wound copper coil wrapped around a core. When 5V is applied, it creates a magnetic field that pulls the armature. * **The Contact System:** Features bifurcated (split) contacts, usually plated with Gold over Silver-Magnesium-Nickel alloy. This ensures high conductivity and prevents oxidation at low signal levels. * **Hermetic Seal:** The entire mechanism is encased in a metal "header" and "can" assembly, then vacuum-baked and backfilled with dry nitrogen to prevent internal arcing and corrosion. --- ### 3. Part Number Breakdown The nomenclature for this specific model generally follows this logic: | Code | Meaning | |:---:|:---| | **RS** | Series identifier (Reliability Standard / Sensitive) | | **5** | Coil Voltage (5 Volts DC) | | **D** | Coil sensitivity or mounting style (usually D-style pins) | | **3** | Internal diode or suppression features (depending on specific catalog) | | **R2** | Revision code or specific lead length/finish | --- ### 4. Circuit Implementation When integrating the RS-5D3-R2, it is common practice to include a "Flyback Diode" (if not already internal to the '3' designation) to protect sensitive driving electronics from inductive spikes. ```python # Logic for driving the relay with a Microcontroller if sensor_input > threshold: GPIO.output(relay_pin, HIGH) # Energizes 5V Coil # Contacts switch from NC (Normally Closed) to NO (Normally Open) else: GPIO.output(relay_pin, LOW) # De-energizes Coil ``` --- ### 5. Common Applications * **Signal Switching:** Routing low-level RF or analog signals in communication equipment. * **Avionics:** Control circuits in aircraft where vibration resistance is critical. * **Medical Devices:** High-reliability switching in diagnostic hardware.